fix(ios): the runner must not answer ok for a launch that failed

XCTest records a refused launch as a test issue that never throws, so the
companion returned ok for an app that never started. Check the state the
app actually reached and report the refusal instead.

companion/Sources/AppLifecycle.swift

@@ -9,6 +9,7 @@ enum AppLifecycle {
     }
 
     static func launch(bundleIdentifier: String, foregroundIfRunning: Bool) throws {
+        var reached = XCUIApplication.State.unknown
         try onMainCatching {
             let application = XCUIApplication(bundleIdentifier: bundleIdentifier)
             if foregroundIfRunning {
@@ -18,6 +19,17 @@ enum AppLifecycle {
             } else {
                 application.launch()
             }
+            reached = application.state
+        }
+        // A refused launch is recorded as a test issue that never throws, so
+        // without this the runner answers ok for an app that is not running
+        // and the host learns nothing until its own bound expires.
+        switch reached {
+        case .runningForeground, .runningBackground, .runningBackgroundSuspended:
+            return
+        default:
+            throw LifecycleError.failed(
+                "\(bundleIdentifier) is \(name(of: reached)) after launch")
         }
     }
 
@@ -54,6 +66,21 @@ enum AppLifecycle {
         return result
     }
 
+    private static func name(of state: XCUIApplication.State) -> String {
+        switch state {
+        case .runningForeground:
+            return "foreground"
+        case .runningBackground:
+            return "background"
+        case .runningBackgroundSuspended:
+            return "suspended"
+        case .notRunning:
+            return "not running"
+        default:
+            return "unknown"
+        }
+    }
+
     // onMainCatching runs automation work on the main thread and converts a
     // framework assertion into a thrown error so the server survives it.
     private static func onMainCatching(_ work: @escaping () -> Void) throws {